While reading that idea about feeding pigs cannabis for better bacon, I began wondering about why the plant would produce THC in the first place. Given the following:
1: THC is not bad for you. There is no LD50 in animals for THC. The toxic effects are minimal.
2: Most plant chemicals
are synthesized by the plant as defenses against herbivores.
It would seem that a nontoxic compound that tended to make big herbivores like goats more hungry would be fairly counterproductive for the plant.
I deduce: The herbivores involved must not be vertebrates. Thu: THC must be bad for insects. It still is unclear what the biologic receptor of THC does in vertebrates. Possibly in other non-vertebrate herbivores this receptor does something essential, and messing with it is toxic.
Therefore: THC is the perfect nontoxic herbicide. Conceivably it could even be an "organic" herbicide, since the organic crowd loves THC. It could be liberally applied to fruits and vegetables and left on all the way to market. The produce buyer could rinse it off or not, as she sees fit. It would also be good for home use, to kill bugs without worrying about junior eating insecticide cakes he encounters - his eyes may be more bloodshot for a while, but no lasting harm done.
I wonder if High Times or some similar publication has written about the control of insect pests on cannabis crops. It would be interesting to know what sort of pests can stomach the THC.
Therefore: THC insecticide.